CN114126130A - Novel headlamp control system and control method - Google Patents

Novel headlamp control system and control method Download PDF

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Publication number
CN114126130A
CN114126130A CN202010906092.5A CN202010906092A CN114126130A CN 114126130 A CN114126130 A CN 114126130A CN 202010906092 A CN202010906092 A CN 202010906092A CN 114126130 A CN114126130 A CN 114126130A
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laser
mcu
pin
driver
brightness
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CN114126130B (en
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徐健
任康成
周杏
王炳伟
于宽
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Changzhou Xingyu Automotive Lighting Systems Co Ltd
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Changzhou Xingyu Automotive Lighting Systems Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The invention belongs to the field of automobile headlamp control, and particularly relates to a novel headlamp control system and a novel headlamp control method, wherein the lamp light of a headlamp is adjusted by adjusting the distance between a hand and a laser emitting end, so that a driver is ensured to control the automobile headlamp in a telescopic arm mode under the condition of not lowering the head; the LED driving circuit comprises an MCU (microprogrammed control unit), an LED driving circuit, a high beam and a dipped headlight; the MCU micro control unit is respectively connected with the high beam lamp and the dipped headlight through the LED drive circuit, and also comprises a laser ranging module which comprises an emitting unit and a receiving unit; the transmitting unit comprises a laser driving module and a laser transmitting end, and the MCU is connected with the laser transmitting end through the laser driving module; the receiving unit comprises a time-to-digital converter, a high-speed comparator, an operational amplifier and a laser receiving end, and the MCU, the time-to-speed converter, the high-speed comparator, the operational amplifier and the laser receiving end are sequentially connected in series.

Description

Novel headlamp control system and control method
Technical Field
The invention belongs to the field of automobile headlamp control, and particularly relates to a novel headlamp control system and a novel headlamp control method.
Background
With the development of automotive technology, safety during driving of vehicles is increasingly considered. For some novice drivers, if the drivers are not familiar with the light control switch during driving at night, the sight line can involuntarily look at the light control switch instead of the advancing direction of the vehicle during the control of light switching, so that great potential safety hazards exist. In order to solve such problems, a novel headlamp control system and a control method thereof are proposed herein to solve the problems to some extent.
Disclosure of Invention
The invention aims to overcome the technical problems in the prior art, and provides a novel headlamp control system and a novel headlamp control method, which realize the light adjustment of a headlamp by adjusting the distance between a hand and a laser emitting end, and can ensure that a driver can control the headlamp of a vehicle in a telescopic arm mode without lowering the head.
In order to solve the technical problems, the invention provides the following technical scheme: a novel headlamp control system comprises an MCU (micro control unit), an LED (light emitting diode) driving circuit, a high beam and a low beam; the MCU micro control unit is respectively connected with the high beam lamp and the dipped headlight through an LED drive circuit, and also comprises a laser ranging module which comprises an emitting unit and a receiving unit;
the transmitting unit comprises a laser driving module and a laser transmitting end, and the MCU is connected with the laser transmitting end through the laser driving module;
the receiving unit comprises a time-to-digital converter, a high-speed comparator, an operational amplifier and a laser receiving end, and the MCU, the time-to-speed converter, the high-speed comparator, the operational amplifier and the laser receiving end are sequentially connected in series.
Preferably, the selection type of the operational amplifier is TI OPA858 IDSG; the high-speed comparator is selected to be TLV3501 of TI; TDC7201ZAXR with T1 as the model of time-to-digital converter; the MCU micro-control unit is selected to be a TI MSP430F 5529.
The TDC7201 and the MCU micro control unit are connected through an SPI bus, namely, the A5 pin, the B5 pin and the C5 pin of the TDC7201 are respectively connected with the P3.2 pin, the P3.1 pin and the P3.0 pin of the MCU micro control unit, and the P3.3 pin and the P3.4 pin of the MCU micro control unit are connected with the corresponding pins of the driving unit, namely, are connected through a UART bus.
Preferably, the high-speed comparator TLV3501 is connected to the MCU via SPI bus, that is, pins a5, B5 and C5 of the TDC7201 are connected to pins P3.2, P3.1 and P3.0 of the MCU.
Preferably, the MCU micro-control unit MSP430F5529 is connected to the laser driver module via a UART bus, that is, the pins P3.3 and P3.4 of the MCU micro-control unit MSP430F5529 are connected to corresponding pins of the laser driver module.
In order to solve the technical problems, the invention provides the following technical scheme: a control method of a novel headlamp control system comprises the following steps: the method comprises the following steps that firstly, a vehicle is started, a novel headlamp control system is powered on, and an MCU (microprogrammed control unit), an LED (light-emitting diode) driving circuit, a high beam dipped headlight and a laser ranging module are initialized;
secondly, controlling a laser driving module through an MCU (micro control unit) to further realize that a laser emitting end emits laser pulses, and when a driver places hands 8-10 cm in front of the laser emitting end and stays for 3 seconds, sending a prompt signal by the MCU to prompt the driver that the system is started;
step three, when the driver needs to turn on the dipped headlight, the driver puts the hand to a position 10-15 cm in front of the laser emitting end and stays for 2 seconds, then the dipped headlight is turned on, and the brightness is 50% of the maximum brightness;
step four, when the driver needs to adjust the brightness of the dipped headlight, the driver puts the hand at a position 16-25 cm in front of the laser emitting end and stays for 2 seconds, and then the brightness of the dipped headlight is automatically adjusted to the maximum brightness;
step five, when the driver needs to turn on the high beam, the driver puts the hand at a position 26-35 cm in front of the laser emitting end and stays for 2 seconds, the low beam is kept on, and the high beam is turned on at the same time, and the brightness of the high beam is 50% of the maximum brightness;
step six, when the driver needs to adjust the brightness of the high beam, the driver puts the hand in front of the laser emitting end for more than 36 cm and stays for 2 seconds, and then the brightness of the high beam is automatically adjusted to be the maximum brightness;
and step seven, when the driver needs to reduce the brightness of the high beam and the low beam or close the high beam and the low beam, the driver approaches the laser emitting end, and the distance between the laser emitting end and the laser emitting end is as shown in the step two to the step six.
The invention has the beneficial effects that: compared with the traditional lamp control system, the novel headlamp control system and the control method can enable the sight of a driver to always face the front when the light is controlled, so that the safety of driving at night is improved; the distance change between the human hand and the laser sensor is calculated through the laser ranging principle, so that the control of the vehicle headlamp is realized through gestures.
Drawings
FIG. 1 is a block diagram of the novel headlamp control system of the present invention;
FIG. 2 is a circuit diagram of the MCU micro control unit of the present invention;
FIG. 3 is a first schematic diagram illustrating a pin of the MCU according to the present invention;
FIG. 4 is a second schematic diagram illustrating a pin of the MCU according to the present invention;
FIG. 5 is a schematic view of a transmitting unit of the novel headlamp control system of the present invention;
fig. 6 is a schematic diagram of a receiving unit of the novel headlamp control system of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
A novel headlamp control system comprises an MCU (micro control unit), an LED (light emitting diode) driving circuit, a high beam and a low beam; the MCU micro control unit is respectively connected with the high beam lamp and the dipped headlight through an LED drive circuit, and also comprises a laser ranging module which comprises an emitting unit and a receiving unit;
the transmitting unit comprises a laser driving module and a laser transmitting end, and the MCU is connected with the laser transmitting end through the laser driving module;
the receiving unit comprises a time-to-digital converter, a high-speed comparator, an operational amplifier and a laser receiving end, and the MCU, the time-to-speed converter, the high-speed comparator, the operational amplifier and the laser receiving end are sequentially connected in series.
The selection type of the operational amplifier is OPA858IDSG of TI; the high-speed comparator is selected to be TLV3501 of TI; TDC7201ZAXR with T1 as the model of time-to-digital converter; the MCU micro-control unit is selected to be a TI MSP430F 5529.
The TDC7201 and the MCU micro control unit are connected through an SPI bus, namely, the A5 pin, the B5 pin and the C5 pin of the TDC7201 are respectively connected with the P3.2 pin, the P3.1 pin and the P3.0 pin of the MCU micro control unit, and the P3.3 pin and the P3.4 pin of the MCU micro control unit are connected with the corresponding pins of the driving unit, namely, are connected through a UART bus.
The high-speed comparator TLV3501 is connected with the MCU through an SPI bus, namely, pins A5, B5 and C5 of the TDC7201 are respectively connected with a pin P3.2, a pin P3.1 and a pin P3.0 of the MCU.
The MCU MSP430F5529 is connected with the laser drive module through a UART bus, namely, a P3.3 pin and a P3.4 pin of the MCU MSP430F5529 are connected with corresponding pins of the laser drive module.
A control method of a novel headlamp control system comprises the following steps: the method comprises the following steps that firstly, a vehicle is started, a novel headlamp control system is powered on, and an MCU (microprogrammed control unit), an LED (light-emitting diode) driving circuit, a high beam dipped headlight and a laser ranging module are initialized;
secondly, controlling a laser driving module through an MCU (micro control unit) to further realize that a laser emitting end emits laser pulses, and when a driver places hands 8-10 cm in front of the laser emitting end and stays for 3 seconds, sending a prompt signal by the MCU to prompt the driver that the system is started;
step three, when the driver needs to turn on the dipped headlight, the driver puts the hand to a position 10-15 cm in front of the laser emitting end and stays for 2 seconds, then the dipped headlight is turned on, and the brightness is 50% of the maximum brightness;
step four, when the driver needs to adjust the brightness of the dipped headlight, the driver puts the hand at a position 16-25 cm in front of the laser emitting end and stays for 2 seconds, and then the brightness of the dipped headlight is automatically adjusted to the maximum brightness;
step five, when the driver needs to turn on the high beam, the driver puts the hand at a position 26-35 cm in front of the laser emitting end and stays for 2 seconds, the low beam is kept on, and the high beam is turned on at the same time, and the brightness of the high beam is 50% of the maximum brightness;
step six, when the driver needs to adjust the brightness of the high beam, the driver puts the hand in front of the laser emitting end for more than 36 cm and stays for 2 seconds, and then the brightness of the high beam is automatically adjusted to be the maximum brightness;
and step seven, when the driver needs to reduce the brightness of the high beam and the low beam or close the high beam and the low beam, the driver approaches the laser emitting end, and the distance between the laser emitting end and the laser emitting end is as shown in the step two to the step six.
The distance change between a human hand and a laser sensor is recognized mainly through a laser ranging principle, so that the control of the vehicle headlamp is realized through gestures. The novel headlamp control system and the control method thereof mainly comprise an MCU micro control module, a laser ranging module and a light driver. The transmitting unit of the laser ranging module mainly comprises a laser driving module and a laser transmitting end, and the receiving unit comprises an operational amplifier, a high-speed comparator and a time-to-digital converter. And the transmitting unit and the receiving unit of the laser ranging module are respectively connected with the MCU micro control module through the SPI bus and the digital signal wire. The MCU micro control module is connected with the light driver through a UART bus.
The received signal is measured using a short time measurement mode of the TDC7201 time-to-digital converter. The TDC7201 internally calculates a time difference between starting and stopping laser pulses to determine the amount of distance of the driver's hand. The start signal (pins a1 and D1 connected to COM _ STAR) is provided by the MCU control chip (pin P2.5), and the signal received by the TLV3501 is the stop signal. The digital output of the TDC7201 is connected to an MCU micro-control module, the micro-control module calculates a real-time distance and compares the real-time distance with a preset distance and a light control strategy, and finally controls a driver to perform brightness and on-off control of the vehicle front lighting lamp according to the comparison result, as shown in Table 1.
Figure BDA0002661517890000061
Figure BDA0002661517890000071
TABLE 1
In particular, by default, the TDC7201 has a minimum measurement time of 12 nanoseconds, which limits the minimum measurement distance to 3.6 meters. The short time mode of the system allows the two measuring chips to work together, and the minimum measuring time is shortened to 250ps, so that the minimum measuring distance is shortened to 7.5 cm.
The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (5)

1. A novel headlamp control system comprises an MCU (micro control unit), an LED (light emitting diode) driving circuit, a high beam and a low beam; MCU little the control unit passes through LED drive circuit and is connected its characterized in that with far-reaching headlamp and dipped headlight respectively: the device also comprises a laser ranging module, wherein the laser ranging module comprises a transmitting unit and a receiving unit;
the transmitting unit comprises a laser driving module and a laser transmitting end, and the MCU is connected with the laser transmitting end through the laser driving module;
the receiving unit comprises a time-to-digital converter, a high-speed comparator, an operational amplifier and a laser receiving end, and the MCU, the time-to-speed converter, the high-speed comparator, the operational amplifier and the laser receiving end are sequentially connected in series.
2. The novel headlamp control system according to claim 1, wherein: the selection type of the operational amplifier is OPA858IDSG of TI; the high-speed comparator is selected to be TLV3501 of TI; TDC7201ZAXR with T1 as the model of time-to-digital converter; the MCU micro-control unit is selected to be a TI MSP430F 5529.
The TDC7201 and the MCU micro control unit are connected through an SPI bus, namely, the A5 pin, the B5 pin and the C5 pin of the TDC7201 are respectively connected with the P3.2 pin, the P3.1 pin and the P3.0 pin of the MCU micro control unit, and the P3.3 pin and the P3.4 pin of the MCU micro control unit are connected with the corresponding pins of the driving unit, namely, are connected through a UART bus.
3. The novel headlamp control system according to claim 2, wherein: the high-speed comparator TLV3501 is connected with the MCU through an SPI bus, namely, pins A5, B5 and C5 of the TDC7201 are respectively connected with a pin P3.2, a pin P3.1 and a pin P3.0 of the MCU.
4. The novel headlamp control system according to claim 2, wherein: the MCU MSP430F5529 is connected with the laser drive module through a UART bus, namely, a P3.3 pin and a P3.4 pin of the MCU MSP430F5529 are connected with corresponding pins of the laser drive module.
5. A control method of a novel headlamp control system according to claim 1, characterized in that: the method comprises the following steps: the method comprises the following steps that firstly, a vehicle is started, a novel headlamp control system is powered on, and an MCU (microprogrammed control unit), an LED (light-emitting diode) driving circuit, a high beam dipped headlight and a laser ranging module are initialized;
secondly, controlling a laser driving module through an MCU (micro control unit) to further realize that a laser emitting end emits laser pulses, and when a driver places hands 8-10 cm in front of the laser emitting end and stays for 3 seconds, sending a prompt signal by the MCU to prompt the driver that the system is started;
step three, when the driver needs to turn on the dipped headlight, the driver puts the hand to a position 10-15 cm in front of the laser emitting end and stays for 2 seconds, then the dipped headlight is turned on, and the brightness is 50% of the maximum brightness;
step four, when the driver needs to adjust the brightness of the dipped headlight, the driver puts the hand at a position 16-25 cm in front of the laser emitting end and stays for 2 seconds, and then the brightness of the dipped headlight is automatically adjusted to the maximum brightness;
step five, when the driver needs to turn on the high beam, the driver puts the hand at a position 26-35 cm in front of the laser emitting end and stays for 2 seconds, the low beam is kept on, and the high beam is turned on at the same time, and the brightness of the high beam is 50% of the maximum brightness;
step six, when the driver needs to adjust the brightness of the high beam, the driver puts the hand in front of the laser emitting end for more than 36 cm and stays for 2 seconds, and then the brightness of the high beam is automatically adjusted to be the maximum brightness;
and step seven, when the driver needs to reduce the brightness of the high beam and the low beam or close the high beam and the low beam, the driver approaches the laser emitting end, and the distance between the laser emitting end and the laser emitting end is as shown in the step two to the step six.
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